I'm 32 weeks pregnant with my second baby boy. About 3 days ago I got a dull pain on the left side…

I'm 32 weeks pregnant with my second baby boy. About 3 days ago I got a dull pain on the left side of my belly.As the night went on, it got worse. the only way I got any relief was to lay on my left side. Every night since then, between about 4 to 6, the pain comes back. Could the baby be on a nerve? What could cause this pain to come back at the same time everyday??